joel is now officially a new york city franchise. he signed on to play a concert at madison square garden once a month indefinitely. it's all part of a growing trend where big name artists stop going on the road and let the road come to them. >> celine dion, elton, and cher. once they happen in vegas, they often stay there. casinos pay big bucks to get exclusive rights to a entertainer for weeks or years. and then they get to build the show of their dreams. >> tuesday night sin city pulled out all of the stops for it's newest recruit, britney spears. she will perform for two years at planet hollywood, nearly 100 shows total. >> we're always looking fortop entertainment. the value is having big name artists in the city, at the property. >> the residency business is great for tourism for these cities because people are making a specific choice to choose vegas over another city or destination to see their favorite act. >> spears has the strip, but it isn't great for everybody. billy joel is more of an east coast guy. he played at madiso